The Stevens Arms Company of Chicopee Falls, Massachusetts, had been producing its Browning-designed M520 and M520-30 shotguns since 1904, and in 1941, the government placed orders for standard, riot gun and trench gun versions.

Indeed, in just a few days, the stench of tear gas in the streets of the nation's largest cities, along with the sound of riot guns, police water cannons and furious residents banging pots and pans in protest, became a nightly phenomena.

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